Qt: Various fixes for localisation

[TheLastRar]

Description of Changes

Ensure that the embedded release date is in UTC.
Translate the git release date/time to match the system local & time zone.
Move MemoryCardListItem into MemoryCardListWidget
Make the new DNS host "New Host" default text translatable (note that existing entries are saved to a file)
Correct/Add context when calling BindWidgetToEnumSetting.

Rationale behind Changes

The displayed Git release date & time should probably match the system time zone (and be localised to the system locale).
Ensuring that the embedded release datetime is in UTC ensure that time zone conversion will be correct.

In our base translation file, most of the strings in MemoryCardListWidget.cpp are under the MemoryCardListItem context.
Moving the MemoryCardListItem into MemoryCardListWidget should hopefully resolve that once the translation action updates.
These strings will probably need to be retranslated.

The docking & anisotropic filtering options where already translatable, but the incorrect/missing context prevented us from loading those translations.

fixes #14810

Suggested Testing Steps

Test that it builds on CI.
Test translating strings.

Did you use AI to help find, test, or implement this issue or feature?

No

[TheLastRar]

Also tackles some of the easier Qt items in #9062

Also, I could alternatively embed a ISO format date/time, since that includes a timezone and thus we can convert from it without having to force git to use UTC.
I think just having it be always be stored as UTC is however a better approach.